Method of surface treatment for metal and nonmetal surfaces

ABSTRACT

A method of surface treatment includes a step of positioning objects on branches and coating a base film on the objects, a step of electro-plating a metal layer on the objects by way of vacuum electroplating, and step of dipping the objects into acrylic electro-coating liquid to coat an anti-rusting acrylic layer on the objects.

FIELD OF THE INVENTION

The present invention relates to a method of a surface treatment forelectro-plating a metal layer on a metal or a nonmetal surface and anon-corrosive acrylic layer is coated on the metal layer.

BACKGROUND OF THE INVENTION

A conventional method for electro-plating a metal layer to an objectsuch as handles of drawers, door handles and locks generally uses astrong acid solution to remove foreign particles and dust from thesurface to be treated and the object is put in an electrolytic tank toelectro-plate a desired metal layer on the surface of the object. Alacquer is coated on the metal layer to be a protection layer. However,it is noted that the chemical solution such as the strong acid solutionis harmful to the environment and the treatment equipment to deal withthe chemical solution is expensive and thereby increasing themanufacturing cost. Besides, only that the objects have metal surfacecan be electro-plated and this restricts the range of use. In addition,the lacquer does not have good anti-corrosive function which isimportant in some circumstances. The lacquer also lacks durability andthe luster is difficult to be maintained. Usually, the object is coatedwith copper, nickel and silver to have an anti-rusting function,nevertheless, the multiple processes increase manufacturing cost too.

The present invention intends to provide a method of surface treatmentfor metal or nonmetal surfaces and the method is less expensive, andmakes the surfaces to be luster and anti-rusting.

SUMMARY OF THE INVENTION

The present invention relates to a method of surface treatment and themethod includes the following steps:

step of positioning objects on branches and coating a base film on theobjects; step of electroplating a metal layer on the objects by way ofvacuum electroplating, and step of dipping the objects intoelectro-coating liquid to coat an anti-rusting layer on the objects.

The primary object of the present invention is to provide a method forgenerating an anti-rusting and shining surface on metal or nonmetalsurfaces.

Another object of the present invention is to provide a method ofsurface treatment and the method reduces pollution to the environmentand is less expensive.

The present invention will become more obvious from the followingdescription when taken in connection with the accompanying drawingswhich show, for purposes of illustration only, a preferred embodiment inaccordance with the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows steps of the method of the present invention;

FIG. 2 shows the objects to be positioned on the braches;

FIG. 3 is an enlarged view to show the objects on the branches;

FIG. 4 shows the objects on the branches are put in an electro-platingtank;

FIG. 5 shows that the objects on the branches are dipped intoelectro-coating liquid, and

FIG. 6 shows a cross sectional view of the object after the surfacetreatment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIGS. 1 to 6, the method of surface treatment of thepresent invention comprises the following steps:

step of objects positioning: positioning objects 20 on branches 12 andcoating a base film 50 on the objects 20;

The branches 12 extend radially from a post 10 which includes top andbottom connection members 11. Each branch 12 is connected with an object20 as show in FIG. 3. The base film 50 allows metal particles to beeasily attached thereon.

step of roasting: putting the objects 20 together with the post 10 andthe branches 12 in to an oven to dry and solidify the base film 50.

step of electro-plating: electro-plating a metal layer on the objects 20by way of vacuum electro-plating;

As shown in FIG. 4, after the base film 50 is dried and solidified, theobjects 20 together with the post 10 and the branches 12 are moved to avacuum electro-plating furnace 30. A positioning disk 31 is located inthe furnace 30 so that the post 10 are positioned on the positioningdisk 31. A power unit 300 is located in the furnace and includes twoelectro poles 32 between which a tungsten filament 33 is connected 33.The tungsten filament 33 is wrapped by metal 34 to be electro-plated.The air in the furnace 30 is sucked out to form a vacuum furnace andwhen the electro poles 32 are powered by electric power, the tungstenfilament 33 is heated so as to let the metal 34 to be electro-platedbecome particles which are attached to the base film 50 to form anelectro-plating layer 51.

step of electro-coating: dipping the objects 20 into electro-coatingliquid to coat an anti-rusting layer on the objects 20.

As shown in FIG. 5, the objects 20 together with the post 10 and thebranches 12 are moved to the electro-coating stand and dipped into anelectro-coating liquid 41 in a tank 40 and the electro-coating liquid 41is an acrylic liquid 41 with ions. The objects 20 and the post 10 areelectric conductive so that the electro-coating liquid 41 is attached tothe surface of the objects 20 to form an anti-rusting acrylic film 52.

step of roasting: putting the objects 20 together with the post 10 andthe branches 12 in to an oven to dry and solidify the anti-rustingacrylic film 52.

step of removing objects from branches.

The objects 20 are removed from the branches 12 when all the steps arecompleted.

The base film 50 fills all the tiny dimples on the surface of theobjects 20 so that the electro-plating layer 51 can be electro-platedthereon. No chemical solution is needed in this step so that thepollution to the environment can be effectively reduced.

Due to the base film 50, the method can electro plate a layer of metalon metal or nonmetal surfaces. The electro-plating layer 51 is incontact with the post 10 so that the objects 20 do no need to removefrom the branches 12 and are dipped into the acrylic electro-coatingliquid 41 for form the anti-rusting acrylic film 52 which is stiff,durable and can maintain the luster.

While we have shown and described the embodiment in accordance with thepresent invention, it should be clear to those skilled in the art thatfurther embodiments may be made without departing from the scope of thepresent invention.

1. A method of surface treatment comprising: step of objectspositioning: positioning objects on branches and coating a base film onthe objects; step of electro-plating: electro-plating a metal layer onthe objects by way of vacuum electro-plating, and step ofelectro-coating: dipping the objects into electro-coating liquid to coatan anti-rusting layer on the objects.
 2. The method as claimed in claim1, wherein the electro-coating liquid is an acrylic liquid with ions. 3.The method as claimed in claim 1, wherein the base film is dried beforeproceeding the step of electro-plating.
 4. The method as claimed inclaim 1, wherein the objects are removed from the branches until all thesteps are completed.